Tunable White template - Wiser for KNX

[admin]

You can do simple linear transition between min/max temperature based on current time relative to sunrise/sunset.

Code:

-- minimum/maximum color temperature
tmin = 2700
tmax = 5000

-- device coordinates
latitude = 0
longitude = 0

sunrise, sunset = rscalc(latitude, longitude)

date = os.date('*t')
now = date.hour * 60 + date.min

now = math.max(now, sunrise)
now = math.min(now, sunset)

pos = (now - sunrise) / (sunset - sunrise)

color = math.floor(tmin + (tmax - tmin) * (1 - pos))

grp.checkupdate('1/1/1', color)